India, April 12 -- The Delhi Metro Rail Corporation (DMRC) has initiated a comprehensive mid-life refurbishment programme for its oldest trains, that of the Blue Line, aiming to bolster passenger safety and comfort, according to a statement on Sunday.

This retrofit initiative targets the earliest rolling stock (RS-1) trains, many of which were inducted between 2002 and 2007 and have now completed nearly 20 years of service.

According to the DMRC, the corporation is refurbishing a total of 70 trains across the Red and Blue lines in a phased manner to align them with modern technological standards. The first phase saw the upgrade of 12 trains, followed by 18 trains in the second phase.

Work on the third phase is currently underway, with ...